2. 职称英语
  3. If 3x+4y=17 and 5x+2y=23, what is the value of x-y?______[img]2014m5x/ct_egreqm

If 3x+4y=17 and 5x+2y=23, what is the value of x-y?______[img]2014m5x/ct_egreqm

游客2025-02-24  29
问题 If 3x+4y=17 and 5x+2y=23, what is the value of x-y?______
选项
答案 3
解析 The correct answer is 3. In order to solve this system of equations, subtract the first equation from the second. The result is 2x-2y=6. Factor out 2 to get 2(x-y)= 6. Divide both sides by 2; x-y=3.
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